[PATCH] nptl: Add tst-minstack-cancel, tst-minstack-exit [BZ #22636]

[fweimer at redhat dot com (Florian Weimer)]

I verified that without the guard accounting change in commit
630f4cc3aa019ede55976ea561f1a7af2f068639 (Fix stack guard size
accounting) the tst-minstack-cancel test fails on an AVX-512F machine.
(tst-minstack-exit still passes.)

The two tests cannot be merged because lazy binding in libgcc occurs
only once and contributes significantly to stack usage, so the first
test would alter stack usage in the second test.

2018-01-10  Florian Weimer  <fweimer@redhat.com>

	[BZ #22636]
	* nptl/Makefile (tests): Add tst-minstack-cancel, tst-minstack-exit.
	* nptl/tst-minstack-cancel.c, nptl/tst-minstack-exit.c: New files.

diff --git a/nptl/Makefile b/nptl/Makefile
index 7265c0a53c..12c69f99d8 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -307,7 +307,7 @@ tests = tst-attr1 tst-attr2 tst-attr3 tst-default-attr \
 	tst-bad-schedattr \
 	tst-thread_local1 tst-mutex-errorcheck tst-robust10 \
 	tst-robust-fork tst-create-detached tst-memstream \
-	tst-thread-exit-clobber
+	tst-thread-exit-clobber tst-minstack-cancel tst-minstack-exit
 
 tests-internal := tst-rwlock19 tst-rwlock20 \
 		  tst-sem11 tst-sem12 tst-sem13 \
diff --git a/nptl/tst-minstack-cancel.c b/nptl/tst-minstack-cancel.c
new file mode 100644
index 0000000000..3d8d0dba70
--- /dev/null
+++ b/nptl/tst-minstack-cancel.c
@@ -0,0 +1,45 @@
+/* Test cancellation with a minimal stack size.
+   Copyright (C) 2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+#include <unistd.h>
+#include <support/check.h>
+#include <support/xthread.h>
+
+static void *
+threadfunc (void *closure)
+{
+  while (1)
+    pause ();
+  return NULL;
+}
+
+static int
+do_test (void)
+{
+  pthread_attr_t attr;
+  xpthread_attr_init (&attr);
+  xpthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);
+  pthread_t thr = xpthread_create (&attr, threadfunc, NULL);
+  xpthread_cancel (thr);
+  TEST_VERIFY (xpthread_join (thr) == PTHREAD_CANCELED);
+  xpthread_attr_destroy (&attr);
+  return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/nptl/tst-minstack-exit.c b/nptl/tst-minstack-exit.c
new file mode 100644
index 0000000000..eb6808e889
--- /dev/null
+++ b/nptl/tst-minstack-exit.c
@@ -0,0 +1,43 @@
+/* Test that pthread_exit works with the minimum stack size.
+   Copyright (C) 2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+#include <unistd.h>
+#include <support/check.h>
+#include <support/xthread.h>
+
+static void *
+threadfunc (void *closure)
+{
+  pthread_exit (threadfunc);
+  return NULL;
+}
+
+static int
+do_test (void)
+{
+  pthread_attr_t attr;
+  xpthread_attr_init (&attr);
+  xpthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);
+  pthread_t thr = xpthread_create (&attr, threadfunc, NULL);
+  TEST_VERIFY (xpthread_join (thr) == threadfunc);
+  xpthread_attr_destroy (&attr);
+  return 0;
+}
+
+#include <support/test-driver.c>